Planning Permission and Permitted Development
Many single-storey rear extensions fall under permitted development and do not require planning permission, subject to size limits. Side and double-storey extensions, and those on properties in conservation areas, generally require a full planning application. Your builder should confirm what applies to your specific property before any other decisions are made.
What to Expect During the Build
A building extension involves groundwork and foundations, structural walls and roof, windows and external doors, insulation to current standards, and internal fit-out including electrical, plumbing if required, and plastering. A well-managed project will have a clear programme of works and a lead contractor who coordinates all trades on your behalf.
Portsmouth is a port city on the south coast of England, the only city in the UK built on an island. It has a rich naval heritage — HMS Victory, Admiral Nelson's flagship at Trafalgar, is preserved in the Historic Dockyard alongside the Mary Rose museum and HMS Warrior. Portsmouth is home to a significant naval base. The Spinnaker Tower on the waterfront is a modern landmark offering panoramic views across the Solent.
Building Regulations and Structural Calculations
All extensions require Building Regulations approval regardless of whether planning permission is needed. Structural calculations by an engineer will be required for any load-bearing work. Your builder should manage the Building Regulations application and arrange inspections at the required stages of construction.